Lili Krakowski on sat 27 jan 07
Stephanie wonders:
"Can anybody tell me please what the difference is between Ferro Frit 3134
and Ferro Frit 3195?
I have a glaze recipe I would like to try that uses both of these. It is a
copper red. However we only have the 3134 available. My teacher was not
sure, but he thought it would be probably be fine to just use the 3134,
upping the quantity to match the total the two combined frits would be.
Would this work? What are the main differences between the two?"
Two frit question:
Frit 3134 is described as:
Na2O 10.3
CaO 20.1
Al203 O
B203 23.1
SiO2 46.5
AND
Frit 3195 is described as:
Na2O 5.7
CaO 11.3
Al2O3 12.1
B2O3 22.4
SiO2 45.5
with a fusion point about 50 degrees higher than 3134.
This information from the Bailey catalog, but I think one also can look up
frits on line.
Now in both cases, as your naked eye can see there is just about twice as
much calcium as soda. And just about the same amount of Boron and Silica in
both. BUT 3134 has no alumina, and Al2O3 a fair amount. So what should you
expect, and , with due respect, your teacher know you should expect? That
without alumina your glaze is likely to run , unless the rest of the glaze
provides a sufficiency of alumina.. (i.e if you are using skimmed milk
instead of full milk in a recipe, you would expect your recipe to be low in
fat UNLESS you make up for lacking fat by addition of it with butter, or
oil, etc.)
Here is the analysis of a recipe with 3134
Na2O .113
K2O .006
MgO .310
CaO .571
Al2O3 .138
B2O3 .219
SiO2 1.331
COE 75.71
And the same recipe with 3195 (in this case the original "real" recipe)
Na2O .082
K2O .007
MgO .367
CaO .545
Al2O3 .253
B2O3 .263
SiO2 1.617
COE 66.37
Both recipes might use more silica, but, as you can tell the difference in
alumina plus the not so great difference in boron will affect your glaze.
So. En cas de malheur I would make blends using the 3134 and upping my clay
content gradually 5% at a time. I would not dash in and make the switch,
because you may end up with shelves beyond cleaning.
Despite the soaring prices, do lettuce know what happens. And by the way:
time to buy a program like Glaze Master (TM) Mmmmmmmmmmm?
Lili Krakowski
Be of good courage
stephani stephenson on sun 28 jan 07
Stephanie,
don't know what temp you are firing to but at cone
04-02, and in unscientific terms
3195 alone , is a clear glossy frit in the melt and
fairly fluid even with the alumina.
no experience with it on copper reds...
3134 has a wide melting range, can impart a bit of
that boron cloudiness to a glaze.
they can have different color responses to oxides, but
then , in the larger picture, both are suitable frits
for use in that temperature range, so substitution one
for the other likely would be a huge disaster, just be
prepared for differences and always test first to
compare how they might differ iin respect to fit on
your clay, running, color, surface quality etc.
i think the given melting point for 3195 is slightly
lower then 3134...
just a few cents worth....
Stephani Stephenson
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